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Your cat and you can both benefit from adding the cat flap inside your bifold door. It can also help keep extreme hot or cold weather from entering your home. The first step is to measure your pet's measurements to determine the size of the door flap you'll need. This will allow you to create a hole of the correct size for the cat flap. Outdoor Access Even those with no DIY skills can manage to install a cat flap to an external backdoor. This will cut down on the cost and headache of hiring a carp